Weighing-scale.



No. 769,645. 'PATENTED sums, 19 0. N. H. J. BROTELLE;

WEIGHING SCALE. APPLICATION FILED FEB. 15,1902.

NO MODEL.

UNITED STATES iatented September 6, 1904.

PATENT OFFICE.

-- WEIGHING-SCALE.

SPECIFICATION forming part of Letters Patent No. 769,645, datedSeptember 6, 190a.

Application filed February 15, 1902. Serial No. 94,258. No model.)

To all whmrt it may concern: I

Be it known that I, OCTAVE NICOLAS HENRI l J osnrn BROTELLE, a subjectof the King of Belgium, and a resident of Oourcelles, Belgium, haveinvented certain new and useful Improvements in \Veighing-Scales, ofwhich the following is a specification.

The object of this invention is to overcome a certain defect generallyinherent in weighing-scales, and is more particularly applicable to thetype known as Roberval scale. This defect consists in that the freeingof the scales of these balances takes place too rapidly 5. 6., at thevery moment when equilibrium is established without the weigher beingWarned of the approaching moment of equilibrium. The \veigher willtherefore be liable to put on overweight in merchandise upon the scale.

Now it is the object of this invention to avoid the aforesaid objectionby the combination of a pointer or indicator with each support of thescale-pans and for this purpose to provide means which will enableeither the pans or some movable part thereof to actuate the saidpointers or indicators. In this manner the operator will be apprised ofthe approaching moment of equilibrium. The known weight of this pointeror indicator acts on the pan containing the merchandise so as to causethe said pan to oscillate with the balance beam and the general pointerimmediately a predetermined slightly smaller weight than the correctweight has been reached. The loss in weight through the action of theindicator is, however, compensated at the moment the exact balance isestablished, so as to prevent the wrong weight being given. I attainthese objects by the means illustrated in the accompanying drawings, inwhich Figure 1 is a face view of the buckle of a Roberval scale. Fig. 2is a side view of the same with the indicator in an elevated position.Fig. 3 is a horizontal section taken above the stop. Fig. 4: is adiagram showing the two vertical suspension-rods of the buckles 1 withinthe stops and in a position of equii librium.

Similar figures denote similar parts throughout the several views.

Referring to Figs. 1, 2, and 3, the stop 1 is formed by the bed of thescale and permits in the usual way passage to the rod 2, carrying thebuckle 3, in which engages the knifeedge 4t of the balance-beam 5.According to my invention 1 mount in the opening of the stop 1 a pivot6, upon which a lever 7 or indicator can freely oscillate. The saidindicator reposes normally in a horizontal position in a groove 8 in theupper part of the stop 1. Further, I mount on the side of the rod 2,carrying the buckle 3, a small rod 9, terminating in a hook 10, adaptedto engage beneath the indicator 7 and lift the same into the elevatedposition (shown in Figs. 1 and 2) when the corresponding pan is in itshighest position. The arrangement is identical for each pan of thescale, so that when the scale is in equilibrium, as indicated at Fig.4:, the two indicators 7 will both be horizontal.

I IVhen, however, the one of the pans rests on its stop, thecorresponding indicator will be In a horizontal position, while theother indicator In connection with the other pan now elevated will belifted by the hook, as shown.

in Figs. 1 and In order to prevent any erky motion of the scale to soact on the correspondingIndicator 7 as to project it suddenly beyond theposition it would occupy when simply reposing upon the hook 10, thepivot 6 may advantageously be fitted with a small stop 11 in anyconvenient manner so as to extend into the path of oscillation of theindicator, as shown in Fig.3, and thus limit its stroke upwardly.

The scale thus completed and improved operates in the following manner:The two indicators have an exactly-predetermined position, and it willbe readily understood that the lifted indicator, in connection with theelevated pan, will produce upon such pan an action which reduces in acorresponding manner the effect of the weights placed in the other pan.The result from this is that if the said indicator weighs, for example,ten grams and the correct balance of the merchandise is established lessthe weight of ten grams the pan will tend to move to the position ofequilibrium. The operator will consequently be apprised before the exactweight is ol tained by the lowering of the indicator corresponding tothe pan on which the merchandise is weighed.- As, however, at the momentof perfect equilibrium the indicator 7 is returned into the groove 8 inthe stop 1, it ceases to have any action upon the pan, and thus theoperator can rely on the accuracy of the weighing operation, as theweight of the merchandise will'necessarily correspond to the weight onthe scale-pan. By this arrangement, therefore, when the weight on thetwo pans approaches the point of equilibrium, whether testing weights orweighing merchandise, the operator will be informed by the lowering ofthe indicator. Moreover, if by inadvertence or negligence an excess ofweight is produced upon one of the pans the corresponding inclicator ofthe other pan will be caused to indicate, by rising in one case or byits immobility in the other case, whether the difference is above orbelow a predetermined weight. Thus two distinct advantages are obtainedby a simple, practical, and economical means which cannot in any wayinterfere with the general sensibility of the scale.

A slightly-modified form of construction according to my invention, asshown in Figs. 5 and 6, has the extra advantage that it can be appliedto a Roberval scale by any unskilled person.

What I claim, and desire to secure by Letters Patent of the UnitedStates, is

In a weighing-scale the combination with the stop and the oscillatingbeam thereof, a rod depending from said beam and having its lower endprovided with a hook, the stop at its upper end having a pivot-pin, anindicating-arm secured to said pin, said rod-hook engaging the underside of said arm at a point to one side of the pivot-pin, said stophaving an opening therein to receive said arm, said rod-hook beingintermediate said stop opening and pivot-pin.

In testimony whereof I affix my signature in presence of two witnesses.

OCTAVE NICOLAS HENRI JOSEPH BROTELLE.

Witnesses:

C. SGHERI, GREGORY PHELAN.

